Dietmar Eggemann authored Jan 28, 2015 and Morten Rasmussen committed Feb 04, 2015

Energy-aware load balancing should only happen if the ENERGY_AWARE feature
is turned on and the sched domain on which the load balancing is performed
on contains energy data.
There is also a need during a load balance action to be able to query if we
should continue to load balance energy-aware or if we reached the tipping
point which forces us to fall back to the conventional load balancing
functionality.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>